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76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
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/* Profile PC and write result to FIFO.
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Copyright (C) 1999 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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/* Nonzero if we are actually doing something. */
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static int active;
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/* The file descriptor of the FIFO. */
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static int fd;
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static void
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__attribute__ ((constructor))
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install (void)
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{
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/* See whether the environment variable `PCPROFILE_OUTPUT' is defined.
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If yes, it should name a FIFO. We open it and mark ourself as active. */
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const char *outfile = getenv ("PCPROFILE_OUTPUT");
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if (outfile != NULL && *outfile != '\0')
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{
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fd = open (outfile, O_RDWR);
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if (fd != -1)
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active = 1;
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}
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}
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static void
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__attribute__ ((destructor))
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uninstall (void)
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{
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if (active)
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close (fd);
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}
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void
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__cyg_profile_func_enter (void *this_fn, void *call_site)
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{
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void *buf[2];
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if (! active)
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return;
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/* Now write out the current position and that of the caller. We do
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this now, and don't cache the because we want real-time output. */
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buf[0] = this_fn;
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buf[1] = call_site;
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write (fd, buf, sizeof buf);
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}
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/* We don't handle entry and exit differently here. */
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strong_alias (__cyg_profile_func_enter, __cyg_profile_func_exit)
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